be, was, were; what, that, those ln Europe，the proportion of peo

be, was, were; what, that, those ln Europe，the proportion of people living in cities______always smaller than______of the work force working in factories.
【正确答案】：was ；that
【题目解析】：第一个空缺少的是be动词，第二个空选择代词that，指代的是the proportion。